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<h1 class="title">glextensions.h 示例文件</h1>
<span class="subtitle">graphicsview/boxes/glextensions.h</span>
<!-- $$$graphicsview/boxes/glextensions.h-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the demonstration applications of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#ifndef GLEXTENSIONS_H</span>
  <span class="preprocessor">#define GLEXTENSIONS_H</span>

  <span class="preprocessor">#include &lt;QtOpenGL&gt;</span>

  <span class="comment">/*
  Functions resolved:

  glGenFramebuffersEXT
  glGenRenderbuffersEXT
  glBindRenderbufferEXT
  glRenderbufferStorageEXT
  glDeleteFramebuffersEXT
  glDeleteRenderbuffersEXT
  glBindFramebufferEXT
  glFramebufferTexture2DEXT
  glFramebufferRenderbufferEXT
  glCheckFramebufferStatusEXT

  glActiveTexture
  glTexImage3D

  glGenBuffers
  glBindBuffer
  glBufferData
  glDeleteBuffers
  glMapBuffer
  glUnmapBuffer
  */</span>

  <span class="preprocessor">#ifndef APIENTRY</span>
  <span class="preprocessor"># define APIENTRY</span>
  <span class="preprocessor">#endif</span>
  <span class="preprocessor">#ifndef APIENTRYP</span>
  <span class="preprocessor"># define APIENTRYP APIENTRY *</span>
  <span class="preprocessor">#endif</span>

  <span class="preprocessor">#ifndef GL_VERSION_1_2</span>
  <span class="preprocessor">#define GL_TEXTURE_3D 0x806F</span>
  <span class="preprocessor">#define GL_TEXTURE_WRAP_R 0x8072</span>
  <span class="preprocessor">#define GL_CLAMP_TO_EDGE 0x812F</span>
  <span class="preprocessor">#define GL_BGRA 0x80E1</span>
  <span class="preprocessor">#endif</span>

  <span class="preprocessor">#ifndef GL_VERSION_1_3</span>
  <span class="preprocessor">#define GL_TEXTURE0 0x84C0</span>
  <span class="preprocessor">#define GL_TEXTURE1 0x84C1</span>
  <span class="preprocessor">#define GL_TEXTURE2 0x84C2</span>
  <span class="preprocessor">#define GL_TEXTURE_CUBE_MAP 0x8513</span>
  <span class="preprocessor">#define GL_TEXTURE_CUBE_MAP_POSITIVE_X 0x8515</span>
  <span class="comment">//#define GL_TEXTURE_CUBE_MAP_NEGATIVE_X 0x8516</span>
  <span class="comment">//#define GL_TEXTURE_CUBE_MAP_POSITIVE_Y 0x8517</span>
  <span class="comment">//#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Y 0x8518</span>
  <span class="comment">//#define GL_TEXTURE_CUBE_MAP_POSITIVE_Z 0x8519</span>
  <span class="comment">//#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Z 0x851A</span>
  <span class="preprocessor">#endif</span>

  <span class="preprocessor">#ifndef GL_ARB_vertex_buffer_object</span>
  <span class="keyword">typedef</span> ptrdiff_t GLsizeiptrARB;
  <span class="preprocessor">#endif</span>

  <span class="preprocessor">#ifndef GL_VERSION_1_5</span>
  <span class="preprocessor">#define GL_ARRAY_BUFFER 0x8892</span>
  <span class="preprocessor">#define GL_ELEMENT_ARRAY_BUFFER 0x8893</span>
  <span class="preprocessor">#define GL_READ_WRITE 0x88BA</span>
  <span class="preprocessor">#define GL_STATIC_DRAW 0x88E4</span>
  <span class="preprocessor">#endif</span>

  <span class="preprocessor">#ifndef GL_EXT_framebuffer_object</span>
  <span class="preprocessor">#define GL_RENDERBUFFER_EXT 0x8D41</span>
  <span class="preprocessor">#define GL_FRAMEBUFFER_EXT 0x8D40</span>
  <span class="preprocessor">#define GL_FRAMEBUFFER_COMPLETE_EXT 0x8CD5</span>
  <span class="preprocessor">#define GL_COLOR_ATTACHMENT0_EXT 0x8CE0</span>
  <span class="preprocessor">#define GL_DEPTH_ATTACHMENT_EXT 0x8D00</span>
  <span class="preprocessor">#endif</span>

  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glGenFramebuffersEXT) (GLsizei<span class="operator">,</span> GLuint <span class="operator">*</span>);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glGenRenderbuffersEXT) (GLsizei<span class="operator">,</span> GLuint <span class="operator">*</span>);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glBindRenderbufferEXT) (GLenum<span class="operator">,</span> GLuint);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glRenderbufferStorageEXT) (GLenum<span class="operator">,</span> GLenum<span class="operator">,</span> GLsizei<span class="operator">,</span> GLsizei);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glDeleteFramebuffersEXT) (GLsizei<span class="operator">,</span> <span class="keyword">const</span> GLuint<span class="operator">*</span>);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glDeleteRenderbuffersEXT) (GLsizei<span class="operator">,</span> <span class="keyword">const</span> GLuint<span class="operator">*</span>);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glBindFramebufferEXT) (GLenum<span class="operator">,</span> GLuint);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glFramebufferTexture2DEXT) (GLenum<span class="operator">,</span> GLenum<span class="operator">,</span> GLenum<span class="operator">,</span> GLuint<span class="operator">,</span> GLint);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glFramebufferRenderbufferEXT) (GLenum<span class="operator">,</span> GLenum<span class="operator">,</span> GLenum<span class="operator">,</span> GLuint);
  <span class="keyword">typedef</span> GLenum (APIENTRY <span class="operator">*</span>_glCheckFramebufferStatusEXT) (GLenum);

  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glActiveTexture) (GLenum);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glTexImage3D) (GLenum<span class="operator">,</span> GLint<span class="operator">,</span> GLenum<span class="operator">,</span> GLsizei<span class="operator">,</span> GLsizei<span class="operator">,</span> GLsizei<span class="operator">,</span> GLint<span class="operator">,</span> GLenum<span class="operator">,</span> GLenum<span class="operator">,</span> <span class="keyword">const</span> GLvoid <span class="operator">*</span>);

  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glGenBuffers) (GLsizei<span class="operator">,</span> GLuint <span class="operator">*</span>);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glBindBuffer) (GLenum<span class="operator">,</span> GLuint);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glBufferData) (GLenum<span class="operator">,</span> GLsizeiptrARB<span class="operator">,</span> <span class="keyword">const</span> GLvoid <span class="operator">*</span><span class="operator">,</span> GLenum);
  <span class="keyword">typedef</span> <span class="type">void</span> (APIENTRY <span class="operator">*</span>_glDeleteBuffers) (GLsizei<span class="operator">,</span> <span class="keyword">const</span> GLuint <span class="operator">*</span>);
  <span class="keyword">typedef</span> <span class="type">void</span> <span class="operator">*</span>(APIENTRY <span class="operator">*</span>_glMapBuffer) (GLenum<span class="operator">,</span> GLenum);
  <span class="keyword">typedef</span> GLboolean (APIENTRY <span class="operator">*</span>_glUnmapBuffer) (GLenum);

  <span class="keyword">struct</span> GLExtensionFunctions
  {
      bool resolve(<span class="keyword">const</span> <span class="type">QGLContext</span> <span class="operator">*</span>context);

      bool fboSupported();
      bool openGL15Supported(); <span class="comment">// the rest: multi-texture, 3D-texture, vertex buffer objects</span>

      _glGenFramebuffersEXT GenFramebuffersEXT;
      _glGenRenderbuffersEXT GenRenderbuffersEXT;
      _glBindRenderbufferEXT BindRenderbufferEXT;
      _glRenderbufferStorageEXT RenderbufferStorageEXT;
      _glDeleteFramebuffersEXT DeleteFramebuffersEXT;
      _glDeleteRenderbuffersEXT DeleteRenderbuffersEXT;
      _glBindFramebufferEXT BindFramebufferEXT;
      _glFramebufferTexture2DEXT FramebufferTexture2DEXT;
      _glFramebufferRenderbufferEXT FramebufferRenderbufferEXT;
      _glCheckFramebufferStatusEXT CheckFramebufferStatusEXT;

      _glActiveTexture ActiveTexture;
      _glTexImage3D TexImage3D;

      _glGenBuffers GenBuffers;
      _glBindBuffer BindBuffer;
      _glBufferData BufferData;
      _glDeleteBuffers DeleteBuffers;
      _glMapBuffer MapBuffer;
      _glUnmapBuffer UnmapBuffer;
  };

  <span class="keyword">inline</span> GLExtensionFunctions <span class="operator">&amp;</span>getGLExtensionFunctions()
  {
      <span class="keyword">static</span> GLExtensionFunctions funcs;
      <span class="keyword">return</span> funcs;
  }

  <span class="preprocessor">#define glGenFramebuffersEXT getGLExtensionFunctions().GenFramebuffersEXT</span>
  <span class="preprocessor">#define glGenRenderbuffersEXT getGLExtensionFunctions().GenRenderbuffersEXT</span>
  <span class="preprocessor">#define glBindRenderbufferEXT getGLExtensionFunctions().BindRenderbufferEXT</span>
  <span class="preprocessor">#define glRenderbufferStorageEXT getGLExtensionFunctions().RenderbufferStorageEXT</span>
  <span class="preprocessor">#define glDeleteFramebuffersEXT getGLExtensionFunctions().DeleteFramebuffersEXT</span>
  <span class="preprocessor">#define glDeleteRenderbuffersEXT getGLExtensionFunctions().DeleteRenderbuffersEXT</span>
  <span class="preprocessor">#define glBindFramebufferEXT getGLExtensionFunctions().BindFramebufferEXT</span>
  <span class="preprocessor">#define glFramebufferTexture2DEXT getGLExtensionFunctions().FramebufferTexture2DEXT</span>
  <span class="preprocessor">#define glFramebufferRenderbufferEXT getGLExtensionFunctions().FramebufferRenderbufferEXT</span>
  <span class="preprocessor">#define glCheckFramebufferStatusEXT getGLExtensionFunctions().CheckFramebufferStatusEXT</span>

  <span class="preprocessor">#define glActiveTexture getGLExtensionFunctions().ActiveTexture</span>
  <span class="preprocessor">#define glTexImage3D getGLExtensionFunctions().TexImage3D</span>

  <span class="preprocessor">#define glGenBuffers getGLExtensionFunctions().GenBuffers</span>
  <span class="preprocessor">#define glBindBuffer getGLExtensionFunctions().BindBuffer</span>
  <span class="preprocessor">#define glBufferData getGLExtensionFunctions().BufferData</span>
  <span class="preprocessor">#define glDeleteBuffers getGLExtensionFunctions().DeleteBuffers</span>
  <span class="preprocessor">#define glMapBuffer getGLExtensionFunctions().MapBuffer</span>
  <span class="preprocessor">#define glUnmapBuffer getGLExtensionFunctions().UnmapBuffer</span>

  <span class="preprocessor">#endif</span>

</pre>
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<!-- @@@graphicsview/boxes/glextensions.h -->
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